Objectives: To assess the knowledge on ill-effects of alcoholism among alcoholic. Method: The research design used for this study was Non experimental Descriptive research design. Results: The findings of the study stated that 8 (26.67%) had inadequate knowledge, 18(63.33%) moderate knowledge on ill effect of alcoholism and 4(10%) had adequate knowledge. Conclusion: Alcoholism is epidemic and moving towards the poorer and least educated in world wide. At present the incidence of alcoholism is steadily increased. Action must be taken to control the alcoholism. The Psychiatric Nurse must involve in teaching the hazards of alcoholism and about the problem faced by the alcoholic as well as the total family and society.